Fix Vultr power controls for stopped instances

app/Services/VultrService.php

@@ -31,7 +31,7 @@ class VultrService
             throw new \Exception('Vultr API error: '.$response->json('error', 'Unknown error'), $response->status());
         }
 
-        return $response->json();
+        return $response->json() ?? [];
     }
 
     private function requestPaginated(string $endpoint, string $resourceKey, array $data = []): array

resources/views/livewire/server/show.blade.php

@@ -140,7 +140,7 @@
                                 </svg>
                             </button>
                         </div>
-                        @if ($server->cloudProviderToken && !$server->isFunctional() && $vultrInstanceStatus === 'stopped')
+                        @if ($server->cloudProviderToken && $vultrInstanceStatus === 'stopped')
                             <x-forms.button wire:click.prevent='startVultrInstance' isHighlighted canGate="update"
                                 :canResource="$server">
                                 Power On

tests/Feature/VultrServerLifecycleTest.php

@@ -236,6 +236,23 @@ it('blocks action validation when Vultr instance is stopped', function () {
     ]);
 });
 
+it('shows Vultr power on button when stopped even if server was previously functional', function () {
+    $this->server->update([
+        'ip' => '1.2.3.5',
+        'vultr_instance_status' => 'stopped',
+    ]);
+    $this->server->settings->update([
+        'is_reachable' => true,
+        'is_usable' => true,
+        'force_disabled' => false,
+    ]);
+
+    expect($this->server->fresh()->isFunctional())->toBeTrue();
+
+    Livewire::test(Show::class, ['server_uuid' => $this->server->uuid])
+        ->assertSee('Power On');
+});
+
 it('starts a Vultr instance', function () {
     Http::fake([
         'https://api.vultr.com/v2/instances/instance-1/start' => Http::response([], 204),

tests/Unit/VultrServiceTest.php

@@ -136,3 +136,17 @@ it('finds an instance by IPv4 or IPv6', function () {
         ->and($service->findInstanceByIp('2001:db8::1')['id'])->toBe('instance-1')
         ->and($service->findInstanceByIp('1.2.3.4'))->toBeNull();
 });
+
+it('handles empty successful responses from Vultr API', function () {
+    Http::fake([
+        'https://api.vultr.com/v2/instances/instance-1/start' => Http::response(null, 204),
+        'https://api.vultr.com/v2/instances/instance-1' => Http::response(null, 204),
+    ]);
+
+    $service = new VultrService('fake-token');
+
+    expect($service->startInstance('instance-1'))->toBe([]);
+    $service->deleteInstance('instance-1');
+
+    Http::assertSentCount(2);
+});